Classical Cryptology Some material

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A good source for classical cryptology literature is Gary Rasmussen's mail order service »Classical Crypto Books«.

• Monoalphabetic substitution (in Perl):
  • Subsidiary functions: auxcrypt.pl
  • Encryption: monoalph.pl
  • Decryption: monodecr.pl
  • Call via WWW form: encryption, decryption.
• Monoalphabetic cryptanalysis (in Perl):
  • Letter count: count.pl
  • Bigram count: bicount.pl
  • Call via WWW form: letter count, bigram count.
  • Pattern search in texts or wordlists: pattword.pl
  • Call via WWW form: Search pattern in dictionary or given text.
• Polyalphabetic substitution and cryptanalysis (in Perl):
  • Porta-Belaso (= general cipher disk) cipher - encryption: porta.pl, decryption: portadec.pl
  • Call via WWW form: encryption, decryption.
  • Kasiski's search for repeated substrings: kasiski.pl - call via WWW form.
  • Friedman's index of coincidence: coinc.pl - call via WWW form.
  • Single rotor cipher: rotor.pl
• Transposition (in Perl):
  • Transposition cipher: transp.pl

Furthermore you might be interested in letter frequency tables:

• Letter frequencies in german.
• Letter frequencies in english.
• Letter frequencies in russian.
• Letter frequencies in several languages.
• Bigram frequencies in german and english.

EMail to Pommerening@imsd.uni-mainz.de.